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Hi Simon,
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<div>When you compute a species using VectorSpecies.of you need to store the result it in a static final field and then access the species from that field. (There are similar restrictions for VarHandles and MethodHandles.)</div>
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<div>This informs the compiler that the species is a compile time constant and therefore it can optimize the expressions that use it and generate optimal hardware instructions for the species's shape.</div>
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<div>Paul.<br id="lineBreakAtBeginningOfMessage">
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<div>On Sep 30, 2024, at 8:44 AM, Simon Parten <quafadas@gmail.com> wrote:</div>
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Hello Project Panama,
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<div>Apologies, if this is the wrong place - first time. I’ve been benchmarking index generation (I want to do linear algebra) with Panama, and obtained the following (surprising to me) results. </div>
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<div>Benchmark (len) Mode Cnt Score Error Units</div>
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<div>IndexBenchmark.index_loop 10000 thrpt 3 476661.430 ± 333415.679 ops/s</div>
<div>IndexBenchmark.index_vec 10000 thrpt 3 821343.888 ± 22086.257 ops/s</div>
<div>IndexBenchmark.index_vec_bad 10000 thrpt 3 31524.934 ± 59643.768 ops/s</div>
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<div><span style="caret-color: rgb(0, 0, 0);">The first two implementations are the “obvious” ones. The third one attempts to instantiate the species differently. My ultimate goal, is to get as DoubleVector SPECIES_PREFFERED, and then calculate indexes for
each, then put it in an array (i.e. have half the number of the preferred integer species for the platform). </span></div>
<div><span style="caret-color: rgb(0, 0, 0);"><br>
</span></div>
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<div style="color: rgb(64, 64, 64); background-color: rgb(255, 255, 255); font-family: "Fira Code", Menlo, Monaco, "Courier New", monospace; font-size: 12px; line-height: 18px; white-space: pre;">
<div><span style="color: rgb(157, 78, 150);">@</span><span style="color: rgb(70, 224, 192);">Benchmark</span></div>
<div><span style="color: rgb(157, 78, 150);">def</span> <span style="color: rgb(99, 99, 36);">
index_loop</span>(<span style="color: rgb(9, 89, 132);">bh</span>: <span style="color: rgb(70, 224, 192);">
Blackhole</span>) <span style="color: rgb(54, 54, 54);">=</span></div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
arr</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
Array</span>.<span style="color: rgb(99, 99, 36);">ofDim</span>[<span style="color: rgb(70, 224, 192);">Int</span>](<span style="color: rgb(9, 89, 132);">lenInt</span>)</div>
<div><span style="color: rgb(157, 78, 150);">var</span> <span style="color: rgb(9, 89, 132);">
i</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(73, 104, 57);">
0</span></div>
<div><span style="color: rgb(157, 78, 150);">while</span> (<span style="color: rgb(9, 89, 132);">i</span>
<span style="color: rgb(99, 99, 36);"><</span> <span style="color: rgb(9, 89, 132);">
lenInt</span>) <span style="color: rgb(157, 78, 150);">do</span></div>
<div><span style="color: rgb(15, 157, 235);">arr</span>(<span style="color: rgb(9, 89, 132);">i</span>)
<span style="color: rgb(54, 54, 54);">+=</span> <span style="color: rgb(73, 104, 57);">
1</span></div>
<div><span style="color: rgb(9, 89, 132);">i</span> <span style="color: rgb(54, 54, 54);">
+=</span> <span style="color: rgb(73, 104, 57);">1</span></div>
<div><span style="color: rgb(157, 78, 150);"></span><span style="color: rgb(157, 78, 150);">end</span><span style="color: rgb(157, 78, 150);">
</span><span style="color: rgb(157, 78, 150);">while</span></div>
<br>
<div><span style="color: rgb(9, 89, 132);">bh</span>.<span style="color: rgb(99, 99, 36);">consume</span>(<span style="color: rgb(15, 157, 235);">arr</span>);</div>
<div><span style="color: rgb(157, 78, 150);">end</span> <span style="color: rgb(99, 99, 36);">
index_loop</span></div>
<br>
<div><span style="color: rgb(157, 78, 150);">@</span><span style="color: rgb(70, 224, 192);">Benchmark</span></div>
<div><span style="color: rgb(157, 78, 150);">def</span> <span style="color: rgb(99, 99, 36);">
index_vec</span>(<span style="color: rgb(9, 89, 132);">bh</span>: <span style="color: rgb(70, 224, 192);">
Blackhole</span>) <span style="color: rgb(54, 54, 54);">=</span></div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
arr</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
Array</span>.<span style="color: rgb(99, 99, 36);">ofDim</span>[<span style="color: rgb(70, 224, 192);">Int</span>](<span style="color: rgb(9, 89, 132);">lenInt</span>)</div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
sp</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
IntVector</span>.<span style="color: rgb(15, 157, 235);">SPECIES_PREFERRED</span></div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
l</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(15, 157, 235);">
sp</span>.<span style="color: rgb(99, 99, 36);">length</span>()</div>
<div><span style="color: rgb(157, 78, 150);">var</span> <span style="color: rgb(9, 89, 132);">
i</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(73, 104, 57);">
0</span></div>
<br>
<div><span style="color: rgb(157, 78, 150);">while</span> <span style="color: rgb(9, 89, 132);">
i</span> <span style="color: rgb(99, 99, 36);"><</span> <span style="color: rgb(15, 157, 235);">
sp</span>.<span style="color: rgb(99, 99, 36);">loopBound</span>(<span style="color: rgb(9, 89, 132);">lenInt</span>)
<span style="color: rgb(157, 78, 150);">do</span></div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
v</span> <span style="color: rgb(54, 54, 54);">:</span> <span style="color: rgb(70, 224, 192);">
IntVector</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
IntVector</span>.<span style="color: rgb(99, 99, 36);">broadcast</span>(<span style="color: rgb(15, 157, 235);">sp</span>,
<span style="color: rgb(9, 89, 132);">i</span>).<span style="color: rgb(99, 99, 36);">addIndex</span>(<span style="color: rgb(73, 104, 57);">1</span>)</div>
<div><span style="color: rgb(15, 157, 235);">v</span>.<span style="color: rgb(99, 99, 36);">intoArray</span>(<span style="color: rgb(15, 157, 235);">arr</span>,
<span style="color: rgb(9, 89, 132);">i</span>)</div>
<div><span style="color: rgb(9, 89, 132);">i</span> <span style="color: rgb(54, 54, 54);">
+=</span> <span style="color: rgb(15, 157, 235);">l</span></div>
<div><span style="color: rgb(157, 78, 150);"></span><span style="color: rgb(157, 78, 150);">end</span><span style="color: rgb(157, 78, 150);">
</span><span style="color: rgb(157, 78, 150);">while</span></div>
<br>
<div><span style="color: rgb(9, 89, 132);">bh</span>.<span style="color: rgb(99, 99, 36);">consume</span>(<span style="color: rgb(15, 157, 235);">arr</span>);</div>
<div><span style="color: rgb(157, 78, 150);">end</span> <span style="color: rgb(99, 99, 36);">
index_vec</span></div>
<br>
<br>
<div><span style="color: rgb(157, 78, 150);">@</span><span style="color: rgb(70, 224, 192);">Benchmark</span></div>
<div><span style="color: rgb(157, 78, 150);">def</span> <span style="color: rgb(99, 99, 36);">
index_vec_bad</span>(<span style="color: rgb(9, 89, 132);">bh</span>: <span style="color: rgb(70, 224, 192);">
Blackhole</span>) <span style="color: rgb(54, 54, 54);">=</span></div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
arr</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
Array</span>.<span style="color: rgb(99, 99, 36);">ofDim</span>[<span style="color: rgb(70, 224, 192);">Int</span>](<span style="color: rgb(9, 89, 132);">lenInt</span>)</div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
spi</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
IntVector</span>.<span style="color: rgb(15, 157, 235);">SPECIES_PREFERRED</span></div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
sp</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
VectorSpecies</span>.<span style="color: rgb(99, 99, 36);">of</span>(<span style="color: rgb(70, 224, 192);">java</span>.<span style="color: rgb(70, 224, 192);">lang</span>.<span style="color: rgb(70, 224, 192);">Integer</span>.<span style="color: rgb(15, 157, 235);">TYPE</span>,
<span style="color: rgb(15, 157, 235);">spi</span>.<span style="color: rgb(99, 99, 36);">vectorShape</span>())</div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
l</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(15, 157, 235);">
sp</span>.<span style="color: rgb(99, 99, 36);">length</span>()</div>
<div><span style="color: rgb(157, 78, 150);">var</span> <span style="color: rgb(9, 89, 132);">
i</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(73, 104, 57);">
0</span></div>
<br>
<div><span style="color: rgb(157, 78, 150);">while</span> <span style="color: rgb(9, 89, 132);">
i</span> <span style="color: rgb(99, 99, 36);"><</span> <span style="color: rgb(15, 157, 235);">
sp</span>.<span style="color: rgb(99, 99, 36);">loopBound</span>(<span style="color: rgb(9, 89, 132);">lenInt</span>)
<span style="color: rgb(157, 78, 150);">do</span></div>
<div><span style="color: rgb(157, 78, 150);">val</span> <span style="color: rgb(15, 157, 235);">
v</span> <span style="color: rgb(54, 54, 54);">:</span> <span style="color: rgb(70, 224, 192);">
IntVector</span> <span style="color: rgb(54, 54, 54);">=</span> <span style="color: rgb(70, 224, 192);">
IntVector</span>.<span style="color: rgb(99, 99, 36);">broadcast</span>(<span style="color: rgb(15, 157, 235);">sp</span>,
<span style="color: rgb(9, 89, 132);">i</span>).<span style="color: rgb(99, 99, 36);">addIndex</span>(<span style="color: rgb(73, 104, 57);">1</span>)</div>
<div><span style="color: rgb(15, 157, 235);">v</span>.<span style="color: rgb(99, 99, 36);">intoArray</span>(<span style="color: rgb(15, 157, 235);">arr</span>,
<span style="color: rgb(9, 89, 132);">i</span>)</div>
<div><span style="color: rgb(9, 89, 132);">i</span> <span style="color: rgb(54, 54, 54);">
+=</span> <span style="color: rgb(15, 157, 235);">l</span></div>
<div><span style="color: rgb(157, 78, 150);"></span><span style="color: rgb(157, 78, 150);">end</span><span style="color: rgb(157, 78, 150);">
</span><span style="color: rgb(157, 78, 150);">while</span></div>
<br>
<div><span style="color: rgb(9, 89, 132);">bh</span>.<span style="color: rgb(99, 99, 36);">consume</span>(<span style="color: rgb(15, 157, 235);">arr</span>);</div>
<div><span style="color: rgb(157, 78, 150);">end</span> <span style="color: rgb(99, 99, 36);">
index_vec_bad</span></div>
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<div>However, constructing the VectorSpecies through the VectorSpecies.of method, appears to have a catastrophic performance impact. Would that be expected? Am I doing something obviously wrong here? </div>
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<div>Kind Regards, </div>
<div>Simon</div>
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</blockquote>
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